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A sample of size n = 50 is drawn from a population whose standard deviation is...

A sample of size n = 50 is drawn from a population whose standard deviation is o= 26.   Find the margin of error for a 90% confidence interval for u.
If the sample size were n= 40, would the margin of error be larger or smaller

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Answer #1

Refer Z-table or use excel function "=NORM.S.INV((1-0.05))" to find the Z-value.

https://drive.google.com/open?id=1miDykB956rSHGgAYD93YaJKxmD9a_oZ1

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Therefore as the sample size is decreased, The margin of error increases.

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